我有一个 AsyncTask 那么多 rss 信息，然后将其应用到 UI。
我有一个加载过程指示器，当它在后台加载信息时，UI 运行顺利，但是当我调用 PublishProgress() 以便编辑 UI 时，指示器卡住了。
这里有一些代码可以更好地解释它:
class LoadRss extends AsyncTask<Void, Void, Void> {
protected Void doInBackground(Void...voids) {
changeRSS(checkedId);
publishProgress();
return null;
}
protected void onPostExecute(Void voids) {
frameAnimation.stop();
syncHomeSymbol.setImageResource(R.drawable.none);
syncHomeSymbol.setBackgroundColor(color.background_dark);
}
@Override
protected void onProgressUpdate(Void... values) {
super.onProgressUpdate(values);
InitHome();
}
}
new LoadRss().execute();
changeRSS 是提取 rss 信息的方法。
InitHome 是更改 UI 的方法。
非常感谢!
初始化首页
private void InitHome() {
if (isNetworkAvailable()) {
homeLayout.removeAllViews();
int enclosureCounter = 0;
for (int i=0;i<rssRes.getLength();i++) {
String title;
final String link;
String description, pubDate;
EnclosureItem enclosure;
title = rssRes.getTitle()[i];
link = rssRes.getLink()[i];
description = rssRes.getDescription()[i];
pubDate = rssRes.getPubDate()[i];
try {
enclosure = rssRes.getEnclosure().get(enclosureCounter);
if (enclosure.getPos() == i) {
LinearLayout horizontal = new LinearLayout(this);
horizontal.setOrientation(LinearLayout.HORIZONTAL);
horizontal.setBackgroundResource(R.drawable.rounded_layout);
LinearLayout.LayoutParams p = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.FILL_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT);
p.setMargins(10, 10, 10, 10);
horizontal.setLayoutParams(p);
horizontal.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
Intent browserIntent = new Intent(Intent.ACTION_VIEW, Uri.parse(link));
startActivity(browserIntent);
}
});
ImageView img = new ImageView(this);
Drawable drawable = LoadImageFromWebOperations(enclosure.getUrl());
img.setImageDrawable(drawable);
LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(120, LinearLayout.LayoutParams.FILL_PARENT);
img.setLayoutParams(layoutParams);
img.setScaleType(ScaleType.CENTER_CROP);
horizontal.addView(img);
LinearLayout vertical = new LinearLayout(this);
vertical.setOrientation(LinearLayout.VERTICAL);
TextView textTitle = new TextView(this);
if (SPM.getFix()) {
textTitle.setGravity(Gravity.LEFT);
}
else {
textTitle.setGravity(Gravity.RIGHT);
}
textTitle.setTextSize(1, 18);
textTitle.setText(Html.fromHtml("<font color='#92b64a'>"+title+"</font><br />"));
vertical.addView(textTitle);
TextView textDescription = new TextView(this);
if (SPM.getFix()) {
textDescription.setGravity(Gravity.LEFT);
}
else {
textDescription.setGravity(Gravity.RIGHT);
}
String str = Html.fromHtml(description).toString();
try{
str = str.substring(0,str.lastIndexOf("\n\n"));
}
catch (IndexOutOfBoundsException e) { }
textDescription.setText(Html.fromHtml(new RssOrganizer(str,false).getDescription()));
vertical.addView(textDescription);
TextView textpubDate = new TextView(this);
if (SPM.getFix()) {
textpubDate.setGravity(Gravity.LEFT);
}
else {
textpubDate.setGravity(Gravity.RIGHT);
}
textpubDate.setText(new RssOrganizer(pubDate,true).getPubDate()+"\n\n");
vertical.addView(textpubDate);
enclosureCounter++;
horizontal.addView(vertical);
homeLayout.addView(horizontal);
}
else {
setRegHome(i);
}
}
catch (IndexOutOfBoundsException e) {
setRegHome(i);
}
}
}
else
{
tRSS.setText(R.string.noINNERinternetConnection);
}
}
private void setRegHome(int i) {
String title;
final String link;
String description, pubDate;
title = rssRes.getTitle()[i];
link = rssRes.getLink()[i];
description = rssRes.getDescription()[i];
pubDate = rssRes.getPubDate()[i];
LinearLayout vertical = new LinearLayout(this);
vertical.setOrientation(LinearLayout.VERTICAL);
vertical.setBackgroundResource(R.drawable.rounded_layout);
LinearLayout.LayoutParams p = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.FILL_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT);
p.setMargins(10, 10, 10, 10);
vertical.setLayoutParams(p);
vertical.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
Intent browserIntent = new Intent(Intent.ACTION_VIEW, Uri.parse(link));
startActivity(browserIntent);
}
});
TextView textTitle = new TextView(this);
if (SPM.getFix()) {
textTitle.setGravity(Gravity.LEFT);
}
else {
textTitle.setGravity(Gravity.RIGHT);
}
textTitle.setTextSize(1, 18);
textTitle.setText(Html.fromHtml("<font color='#92b64a'>"+title+"</font><br />"));
vertical.addView(textTitle);
TextView textDescription = new TextView(this);
if (SPM.getFix()) {
textDescription.setGravity(Gravity.LEFT);
}
else {
textDescription.setGravity(Gravity.RIGHT);
}
String str = Html.fromHtml(description).toString();
try{
str = str.substring(0,str.lastIndexOf("\n\n"));
}
catch (IndexOutOfBoundsException e) { }
textDescription.setText(Html.fromHtml(new RssOrganizer(str,false).getDescription()));
vertical.addView(textDescription);
TextView textpubDate = new TextView(this);
if (SPM.getFix()) {
textpubDate.setGravity(Gravity.LEFT);
}
else {
textpubDate.setGravity(Gravity.RIGHT);
}
textpubDate.setText(new RssOrganizer(pubDate,true).getPubDate()+"\n\n");
vertical.addView(textpubDate);
homeLayout.addView(vertical);
}
最佳答案
onProgressUpdate(...) 在 UI 线程上运行，因此它不应该执行大量耗时的工作 - 这首先就无法使用 AsyncTask。
理想情况下，onProgressUpdate(...) 应仅提供基本进度更新，例如完成百分比或指示进度的简单文本消息。
用于显示进度的所有 View 都应事先创建，但是，许多人为此使用 onPreExecute() 。
关于java - AsyncTask 卡住 UI，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/10058123/